
.main-box {
    width: 1500px; /* 固定宽度 */
    height: 730px; /* 固定高度 */
    overflow: hidden; /* 防止内容超出边界 */
    border: 1px solid #EEE;
    box-shadow: 1px 1px 12px 2px #eee;
    background: yellow;

}

.canvas-container {
    width: 100%;
    height: 100%;
    background: #eee;
    /*position: absolute;*/
    /*top: 0;*/
    /*left: 0;*/
    /*z-index: 2; !* Konva canvas 在背景图片之上 *!*/
}
#contextMenu {
    position: absolute;
    background-color: white;
    border: 1px solid #ccc;
    box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.3);
    z-index: 1000;
}

#contextMenu a {
    display: block;
    padding: 8px 16px;
    text-decoration: none;
    color: #333;
}

#contextMenu a:hover {
    background-color: #f0f0f0;
}